Relation pm#sub_situation__subsituation (pm#situation,pm#situation)
  exclusion:  pm#spatial_part
  supertype:  pm#part
  subtype:  pm#sub_process__subproces (pm#process,pm#process)
  subtype:  dl#temporal_part__P.T (dl#perdurant,dl#perdurant)
  subtype:  dl#spatial_part__spatialpart__P.S (dl#perdurant,dl#perdurant)